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Quality of Service (QoS)

Definition - What does Quality of Service (QoS) mean?

Quality of service (QoS) refers to a network’s ability to achieve maximum bandwidth and deal with other network performance elements like latency, error rate and uptime. Quality of service also involves controlling and managing network resources by setting priorities for specific types of data (video, audio, files) on the network. QoS is exclusively applied to network traffic generated for video on demand, IPTV, VoIP, streaming media, videoconferencing and online gaming.

Techopedia explains Quality of Service (QoS)

As the number of Internet users continues to grow, network performance requirements must increase right along with them. In addition, many of the latest online services require high amounts of bandwidth and network performance. Network performance is an element of concern both for the user and the service provider. Internet service providers need to apply techniques and technologies to provide the best service possible before their competitors beat them to it.

The primary goal of quality of service is to provide priority to networks, including dedicated bandwidth, controlled jitter, low latency and improved loss characteristics. Its technologies supply the elemental building blocks that will be used for future business applications in campus, wide area networks and service provider networks.

There are three fundamental components for basic QoS implementation:

  • Identification and marking techniques for coordinating QoS from end to end between network elements
  • QoS within a single network element
  • QoS policy, management, and accounting functions to control and administer end-to-end traffic across a network
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